May I suggest not bolting it down. I have a large board my husband made me to use as a cutting table, I keep it on 2 bookcases but when I want more floor space I can take it off and lean it against the wall (its about 3 X 6 feet). Large enough for a really big cutting mat which I keep in place with double sided adhesive tape. It's heavy enough that the only time it moves is if someone leans against the edge.
Also if it's not bolted in place it's easier to rearrange the room if I want to.
Longarm